The
angle above horizontal that an observer must look to see an
object that is higher than the observer. Note: The angle
of elevation is congruent to the angle
of depression (this assumes the object is close enough to the observer so that the horizontals for the observer and the object are effectively parallel; this would not be the case for a ground tracking station observing a satellite in orbit around the earth).

this page updated
28-jul-14
Mathwords: Terms and Formulas from Algebra I to Calculus
written, illustrated, and webmastered by Bruce Simmons